Question

它表示匹配整个单词使用“\ bpattern \ b” 这适用于匹配整个单词而没有任何特殊字符，因为它仅用于单词字符！

我需要一个表达式来匹配带有特殊字符的单词。我的代码如下

class Program
{
    static void Main(string[] args)
    {
        string str = Regex.Escape("Hi temp% dkfsfdf hi");
        string pattern = Regex.Escape("temp%");
        var matches = Regex.Matches(str, "\\b" + pattern + "\\b" , RegexOptions.IgnoreCase);
        int count = matches.Count;
    }
}

但由于％而失败。我们有解决方法吗？ 可以有其他特殊字符，如'space'，'（'，'）'等

Answer 1

如果您有非单词字符，则无法使用\b。您可以使用以下

@"(?<=^|\s)" + pattern + @"(?=\s|$)"

编辑：正如Tim在评论中提到的那样，你的正则表达式失败正是因为\b无法匹配%与其旁边的空格之间的边界，因为两者都是他们是非单词字符。 \b仅匹配单词字符和非单词字符之间的边界。

详细了解字词边界here。

<强>解释

@"
(?<=        # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind)
               # Match either the regular expression below (attempting the next alternative only if this one fails)
      ^           # Assert position at the beginning of the string
   |           # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      \s          # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks)
)
temp%       # Match the characters “temp%” literally
(?=         # Assert that the regex below can be matched, starting at this position (positive lookahead)
               # Match either the regular expression below (attempting the next alternative only if this one fails)
      \s          # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks)
   |           # Or match regular expression number 2 below (the entire group fails if this one fails to match)
      $           # Assert position at the end of the string (or before the line break at the end of the string, if any)
)
"

Answer 2

如果模式可以包含Regex特有的字符，请先通过Regex.Escape运行。

你这样做了，但不转义你搜索的字符串 - 你不需要它。

Answer 3

output = Regex.Replace(output, "(?<!\w)-\w+", "")
output = Regex.Replace(output, " -"".*?""", "")

Answer 4

这个问题的答案可以在这里找到

Regex expression to match whole word

感谢您的所有答案！

正则表达式匹配整个单词与特殊字符不起作用？

4 个答案: